djvu | f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f

Analysis

max time kernel
142s
max time network
124s
platform
windows11-21h2_x64
resource
win11-20240419-en
resource tags

arch:x64arch:x86image:win11-20240419-enlocale:en-usos:windows11-21h2-x64system
submitted
20/05/2024, 16:10

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General

Target
f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe
Size 723KB
Sample240520-tmfglsge82
SHA256 f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f
MD5 ff0f3e2bf5bd5afd862d8d251070892a
SHA1 9606221794b75771277a28a61076fda69629dc2d
SHA512 9aad3ad297181bbd936c6725e343edd0e5e7d6eceb189dd259f03450a47feab49a1b61c54bc67fd43a49d6cc061484ec2e8ed01cfee23a37fef41966c358356d
SSDEEP 12288:+tAcm3YbfKSkxflS91MtQdBDX9M0SP7q+Sv4fX42UdvdsMusbpe8fq0:+WcmzJ219i0w7xE4g2UdjpeCq0
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

djvu discovery persistence ransomware

Malware Config

Extracted

Family

djvu

http://cajgtus.com/test1/get.php

Attributes

extension
.vepi
offline_id
EGfa5svnSGFJka7LZBQoqff0QtO1IpTauoDvGvt1
payload_url
http://sdfjhuz.com/dl/build2.exe

http://cajgtus.com/files/1/build3.exe
ransomnote
ATTENTION! Don't worry, you can return all your files! All your files like pictures, databases, documents and other important are encrypted with strongest encryption and unique key. The only method of recovering files is to purchase decrypt tool and unique key for you. This software will decrypt all your encrypted files. What guarantees you have? You can send one of your encrypted file from your PC and we decrypt it for free. But we can decrypt only 1 file for free. File must not contain valuable information. Do not ask assistants from youtube and recovery data sites for help in recovering your data. They can use your free decryption quota and scam you. Our contact is emails in this text document only. You can get and look video overview decrypt tool: https://wetransfer.com/downloads/33b490a613f49fa190924f199d2c079e20240512191214/caaf73 Price of private key and decrypt software is $999. Discount 50% available if you contact us first 72 hours, that's price for you is $499. Please note that you'll never restore your data without payment. Check your e-mail "Spam" or "Junk" folder if you don't get answer more than 6 hours. To get this software you need write on our e-mail: [email protected] Reserve e-mail address to contact us: [email protected] Your personal ID: 0871PsawqS

rsa_pubkey.plain

Signatures

Detected Djvu ransomware 17 IoCs

resource	yara_rule
behavioral2/memory/3400-2-0x00000000022F0000-0x000000000240B000-memory.dmp	family_djvu
behavioral2/memory/4440-3-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4440-4-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4440-5-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4440-6-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/4440-19-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2120-23-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2120-24-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2120-26-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2120-31-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2120-32-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2120-33-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2120-36-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2120-38-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2120-39-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2120-40-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu
behavioral2/memory/2120-41-0x0000000000400000-0x0000000000537000-memory.dmp	family_djvu

Djvu Ransomware
Ransomware which is a variant of the STOP family.
ransomware djvu

Modifies file permissions 1 TTPs 1 IoCs

discovery

File and Directory Permissions Modification

T1222

pid	Process
2668	icacls.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1474490143-3221292397-4168103503-1000\Software\Microsoft\Windows\CurrentVersion\Run\SysHelper = "\"C:\\Users\\Admin\\AppData\\Local\\78155823-005f-4506-a17f-cf1dc4ecb8a6\\f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe\" --AutoStart"	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe

Looks up external IP address via web service 3 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
1	api.2ip.ua
2	api.2ip.ua
6	api.2ip.ua

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3400 set thread context of 4440	3400	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	78
PID 1700 set thread context of 2120	1700	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	85

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4440	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe
4440	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe
2120	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe
2120	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe

Suspicious use of WriteProcessMemory 26 IoCs

description	pid	Process	procid_target
PID 3400 wrote to memory of 4440	3400	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	78
PID 3400 wrote to memory of 4440	3400	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	78
PID 3400 wrote to memory of 4440	3400	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	78
PID 3400 wrote to memory of 4440	3400	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	78
PID 3400 wrote to memory of 4440	3400	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	78
PID 3400 wrote to memory of 4440	3400	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	78
PID 3400 wrote to memory of 4440	3400	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	78
PID 3400 wrote to memory of 4440	3400	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	78
PID 3400 wrote to memory of 4440	3400	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	78
PID 3400 wrote to memory of 4440	3400	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	78
PID 4440 wrote to memory of 2668	4440	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	80
PID 4440 wrote to memory of 2668	4440	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	80
PID 4440 wrote to memory of 2668	4440	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	80
PID 4440 wrote to memory of 1700	4440	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	81
PID 4440 wrote to memory of 1700	4440	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	81
PID 4440 wrote to memory of 1700	4440	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	81
PID 1700 wrote to memory of 2120	1700	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	85
PID 1700 wrote to memory of 2120	1700	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	85
PID 1700 wrote to memory of 2120	1700	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	85
PID 1700 wrote to memory of 2120	1700	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	85
PID 1700 wrote to memory of 2120	1700	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	85
PID 1700 wrote to memory of 2120	1700	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	85
PID 1700 wrote to memory of 2120	1700	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	85
PID 1700 wrote to memory of 2120	1700	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	85
PID 1700 wrote to memory of 2120	1700	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	85
PID 1700 wrote to memory of 2120	1700	f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe	85

C:\Users\Admin\AppData\Local\Temp\f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe
"C:\Users\Admin\AppData\Local\Temp\f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3400
- C:\Users\Admin\AppData\Local\Temp\f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe
  "C:\Users\Admin\AppData\Local\Temp\f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe"
  2⤵
  - Adds Run key to start application
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:4440
- - C:\Windows\SysWOW64\icacls.exe
    icacls "C:\Users\Admin\AppData\Local\78155823-005f-4506-a17f-cf1dc4ecb8a6" /deny *S-1-1-0:(OI)(CI)(DE,DC)
    3⤵
    - Modifies file permissions
    PID:2668
- - C:\Users\Admin\AppData\Local\Temp\f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe
    "C:\Users\Admin\AppData\Local\Temp\f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe" --Admin IsNotAutoStart IsNotTask
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious use of WriteProcessMemory
    PID:1700
  - - C:\Users\Admin\AppData\Local\Temp\f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe
      "C:\Users\Admin\AppData\Local\Temp\f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe" --Admin IsNotAutoStart IsNotTask
      4⤵
      Suspicious behavior: EnumeratesProcesses
      PID:2120

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

File and Directory Permissions Modification

T1222

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA
Size 1KB
SHA256 ab2d2c145ab00319ef5b1c4fe09623700a26c25fa009dc18bc3cde11c5bda0ec
MD5 4729bdc0e745b3293b606e2af8a3986f
SHA1 5c5bca22089d566d5f4e2836ea97026952ae1b1d
SHA512 381e495c91ce282e54940596b53998e152e196eb257853e3c0d97a3e4a26cbf7041cfcaf179ad213d93058aeee9987292dd2302a1219b23a2190aa898910466a
MD5 SHA1 SHA512

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CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
Size 724B
SHA256 58f381c3a0a0ace6321da22e40bd44a597bd98b9c9390ab9258426b5cf75a7a5
MD5 8202a1cd02e7d69597995cabbe881a12
SHA1 8858d9d934b7aa9330ee73de6c476acf19929ff6
SHA512 97ba9fceab995d4bef706f8deef99e06862999734ebe6a05832c710104479c6337cbf0a76e1c1e0f91566a61334dc100d837dfd049e20da765fe49def684f9c9
MD5 SHA1 SHA512

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24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA
Size 410B
SHA256 c191b566ef2f78b6eb45e45f96f1d7edbf7e8b498151da0b2189d992cc354dd8
MD5 8868a4944ba42410c82c7e6f0caf16d0
SHA1 5510ec3a399eadb3c60007d886de881f195775df
SHA512 b1e8a3edd7ef148b5f932f64f633c9a0901297317f7bfeccf75452082820a4000e532ab95f0fcfabdedecfed26eb06d5e516289354e8f4316dd2a11422b1c022
MD5 SHA1 SHA512

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CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
Size 392B
SHA256 6c54b80039867d1cadcb5c6a3ef577b395202f69efdf82c535c94556b1005909
MD5 d5639998d662038c3753ad6bf55f7bb3
SHA1 dc20fc6f66600fa6f16b0a3d01e14580b7341a42
SHA512 66df0ed7f1bddfbedd8901a463eff5c8415956f6df4d249a6be9962d7d72e856c8dfa6d396f11fabe76cffa95f834251c512335dcbb5b15608ac1bcb445a6d64
MD5 SHA1 SHA512

Submit Download

f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe

Path C:\Users\Admin\AppData\Local\78155823-005f-4506-a17f-cf1dc4ecb8a6\f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f.exe
Size 723KB
SHA256 f4522c4451ca021e35bdf6e7e7ba7e860d763b00aa5cd09794d3ee677963044f
MD5 ff0f3e2bf5bd5afd862d8d251070892a
SHA1 9606221794b75771277a28a61076fda69629dc2d
SHA512 9aad3ad297181bbd936c6725e343edd0e5e7d6eceb189dd259f03450a47feab49a1b61c54bc67fd43a49d6cc061484ec2e8ed01cfee23a37fef41966c358356d
SSDEEP 12288:+tAcm3YbfKSkxflS91MtQdBDX9M0SP7q+Sv4fX42UdvdsMusbpe8fq0:+WcmzJ219i0w7xE4g2UdjpeCq0
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/1700-21-0x0000000000400000-0x00000000004FF000-memory.dmp

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memory/1700-25-0x0000000000400000-0x00000000004FF000-memory.dmp

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memory/2120-26-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2120-32-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2120-23-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2120-24-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2120-41-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2120-40-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2120-39-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2120-38-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2120-36-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2120-33-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/2120-31-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/3400-1-0x0000000002130000-0x00000000021C4000-memory.dmp

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memory/3400-2-0x00000000022F0000-0x000000000240B000-memory.dmp

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memory/4440-3-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4440-4-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4440-5-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4440-19-0x0000000000400000-0x0000000000537000-memory.dmp

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memory/4440-6-0x0000000000400000-0x0000000000537000-memory.dmp

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